Here's the cover to the first "Action Comics" No. 1 in 73 years --  and the latest version of Superman is part E.T., part Paul Bunyan and  even a little Bruce Springsteen. 
  "This is a young Superman who  still believes a better world for everyone is possible," said writer  Grant Morrison, who'll be chronicling the Man of Steel's days as the  world's first superhero when
 DC Comics relaunches its entire line of comics in September. 
  The Post got a sneak peek ahead of this week's San Diego Comic-Con. 
   While most of the titles, including "Batman" and "Green Lantern," will  showcase DC's iconic heroes when they're well into their careers,  "Action Comics" shows the earliest adventures of Superman, who's  initially a bluejeans-and-T-shirt-wearing crimefighter with a small red  cape. 
            			
 			 
 			    Superman 
 			
 	      	   	     	      
 	
 	 
          "We felt it was time for the big adventures of a 21st-century Paul  Bunyan who fights for the weak and downtrodden against bullies of all  kinds, from robot invaders and crime lords to corrupt city officials,"  said Morrison, a former "X-Men" writer. 
  "The new look reflects his status as a street-level defender of the ordinary man and woman." 
   The series will show how Clark Kent becomes the world's foremost  superhero and how he got his iconic costume, which has been tweaked in  the new continuity -- meaning no more red briefs. 
  The original  "Action Comics" No. 1 (inset), which featured the debut of Superman, is  one of the world's most sought-after comics. A copy sold for $1.5  million last March.